メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.348820752976 44.4866310668299, 142.349751413851 44.4868181681352, 142.349505588002 44.4873292370646, 142.348584448456 44.4871294715065, 142.347709987441 44.4869210077986, 142.347963492932 44.4864587323818, 142.348820752976 44.4866310668299)) ^^http://www.opengis.net/ont/geosparql#wktLiteral